2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64877We give a combinatorial form of the Kadison-Singer problem, a famous problem in C*-algebra. This combinatorial problem, which has several minor variations, is a discrepancy question about vectors in C^n. Some partial results can be easily deduced from known facts in discrepancy theory.13 pagesCombinatoricsFunctional AnalysisOperator Algebras05A99, 11K38, 46L05text